PROPERTIES OF MATTER
I.Four alternatives are given to each of the following .Choose the right
answer.
1.The most malleable metal is
a.copper b.silver c.gold d.iron
2.The unit of stress is
A.kgm-2 b.Nkg-1 c.Nm-2 d.N
II. Answer the following.
1.When the is a body said to be perfectly elastic?
Ans: If a body regains its original size and shape completely after the deforming
forces are removed then the body is said to be perfectly elastic.
2.Define coefficient of elasticity.
Ans:Co-efficient of elasticity is defined as the ratio of stress to strain.
E=Stress / Strain
3.State Hook’s law.
Ans:For small deformation of a body the stress and strain are proportional to each
other. This is Hook’s law.
K=Stress /Strain
4.Distinguish between elastic and plastic materials.
Ans: Plastic:*The body retains completely its deformed size and shape after the deformed
forces are removed.
Elastic:-
*I f the body regains original size and shape completely after the deformed forces
are removed.
5. State different modulii of elasticity.
i) Young’s modulus is defined as the ratio of longitudinal stress to longitudinal
strain with in elastic limits.
II) Bulk modulus is defined as the ratio of bulk stress to bulk strain.
III)Rigidity modulus is defined as the ratio of tangential stress to sharing strain.
6. What is stress and strain?
Ans The restoring force per unit area is known as stress. The fractional change in
the dimension of a body produced by the external force acting on it is known as
strain.
7. What is the meaning of ductility?
Ans The property of metals by which it can be drawn into wire. This property is
called ductility.
8. Define malleability.
Ans The property of metals by which it can be beaten into thin sheets is called
malleability.
III) Give reasons:1) The elastic properties of steel are essential while designing a building.
A) The elastic behavior of the steel is helpful in designing a building
because building pillars and other connections should not change the
shape after construction.
2) A rubber tube is longer when suspended vertically then when placed
horizontally on table.
A) The action of gravitational force is more on vertically hanged rubber
tube than that acting on horizontally kept rubber tube on the table .
Also table exerts a reaction against gravitational force.
UNIT-2
SYNTHETIC MATERIAL
I)
Choose the right answer:i)
In the given types of plastic melamine is a thermosetting plastic.
ii)
Cement is a mixture of calcium silicate, calcium aluminate and
gypsum.
iii)
The chemical name of Na2CO3*10H2O is sodium carbonate deca
hydrate.
iv)
The fire proof jackets are made up of plaster of paris.
II)
Match the following:1)
2)
3)
4)
Slurry = Homogenous mixture
Non stick cock ware= Teflon
Cellulose= Biodegradable
Caustic soda = Sodium hydroxide
III. Answer the following .
1. Name two types of plastics. Write any two differences between them.
Ans: Two types of plastic are:
1)Thermoplastic
2)Thermosetting plastic.
THERMOPLASTIC:
*They can be melted.
*It can be moulded to any desired shape any number of time.
THERMOSETTING PLASTIC:
*They cannot be melted.
*Can be moulded. But after solidification they cannot be melted and remoulded.
2.Difference between biodegradable and non biodegradable substances.
Ans: BIODEGRADABLE;
*Substance which undergo actions of microbial organisms are called
biodegradable substances.Eg: Almost all natural materials.
NON BIODEGRADABLE :
*substances which do not change and no microbial organisms act on them ,are
non biodegradable substances. Eg: plastic, cement, glass etc.
3.How is washing soda prepared.
Ans;A cold and concentrated solution of sodium chloride is saturated with
ammonia to make ammonical brine. which is further made to react with CO2 to
produce NaHCO3.
NaCl+NH3+CO2+H2O------------------NaHCO3+NH4Cl
Sodium bicarbonate on heating produces sodium carbonate
2NaHCO3----------------------Na2CO3+H2O+CO2
Washing soda is obtained by the crystallization of sodium carbonate .Sodium
carbonate is recrystalised by dissolving in water.
NaCO3+10H2O----->Na2CO3.10H2O.
4.Mention the properties of plaster of paris.
Ans: Properties of plaster of paris are:
*plaster of paris is a white powder which is insoluble in water.
*when plaster of paris is mixed with water crystals of gypsum are produced but
they set to form a hard solid mass.
5.List out disadvantages of plastics.
Ans: Disadvantages of plastics are:
*Burning of plastic releases poisonous gases causing air pollution.
*Using plastic bags and cans for packing food items is dangerous to health.
*Collection of unwanted plastic materials increases the growth of pathogens.
*Plastic reduces the sinking of water to the underground and prevent restoration
of water.
*Since plastic is non biodegradable it causes environmental pollution.
*Stray animal eat plastics along with the food contents in them. This may lead to
their death.
6. With a neat labeled diagram explain the process of manufacturing of cement.
Ans For diagram refer page no-149.
Finely powdered clay and limestone are mixed with water to from a
homogenous mixture called slurry which introduced into a rotary kiln
.Hot air at 1873K is blown from the lower end of the rotary kiln.
Due to the high temperature water present in the slurry evaporates
,with clay and lime stone combining chemically to from red clinker of
cement .Clinker are taken out of the kiln ,cooled and then finely
powdered and mixed with 3%gypsum.Gypsum slow down the rapid
setting of cement.
7. How is plaster of paris prepared?
Ans; When gypsum CaSO4.2H2O is heated at 373K it loses 75%of its
water of crystalisation and giving calcium sulphate hemihydrates called
plaster of paris.
CaSO4.2H2O---------------CaSO4.1/2H2O+11/2H2O
8.List out measures that you would like to take to avoid plastic pollution.
Ans: following are the measures to be taken to avoid plastic pollution
are;
*Avoid throwing of plastic articles here and there after use.
*Plastic material should not be burnt.
*Make use of cloth bags or jute bags while shopping.
*Say’s NO to plastics to protect our environment .
*Keep plastic bag dry and clean for reusing.
* Use of biodegradable plastic instead of non biodegradable plastics.
*Use the 4-R principle with respect plastic .This principle is Reduce
,Reuse ,Recycle and Recover (RRRR).
STD-IX
CHAPTER-3
CHEMISTRY
CHEMICALS IN OUR DAILY LIFE
I.
Choose the right answer.
1. The symbol of most essential elements required for development of
all the plant.
(a)N,P ,K
(b)S, Pb ,K
(c)K, Cu ,F
(d)P ,Ca,Pt
2. The leaves die out early is because of the deficiency of
(a)Nitrogen
(b) Phosphorous
(c)Potassium
(d) Iron
3. The traces of these element is required for the plants
(a)Iron and Silver
(b) Calcium and Plutonium
(c)Nitrogen and Nickel (d) Iron and Maganese
4. An example for Nitrogenous fertilizer is
(a)Super phosphate
(b)urea
(c)Potassium sulphate (d) Potassium Chloride
5. Characteristics of good fertilizer is
(a)Non Toxic
(b) deliquescent
(c)Non Toxic, deliquescent & (d)Insoluble in water
Water soluble
II.
Fill in the blanks.
1. Ammonia is highly soluble in water .
2.In manufacture of Superphosphate bone ash is mixed with
concentrated sulphuric acid.
3. N2 + 3H2-------------->2NH3 is an example for Chemical combination reaction.
4. The decrease of the oxygen content of water leading to the death of aquatic
life.
III. Match the following .
A
1.
2.
3.
4.
5.
Super phosphate
Urea
Ammophos
Di ammonium phosphate
Potassium sulphate
III.
B
a. (NH4)2HPO4(4)
b. (NH4)H2PO4 (3)
c. K2SO4(5)
d. NH2.CO.NH2 (2)
e.Ca(H2PO4)2+2CaSO4.2H2O (1)
Answer the following.
1. What is fertilizer ?
Ans-Supplementary material that is added to soil to increase its fertility and for
the growth of the plants is known as fertilizer. Eg: nitrogen, phosphate and
potassium etc.
2. What are the characteristics of good fertilizer ?
Ans- The characteristic of good fertilizer are
 It should be soluble in water so that it can penetrate the soil and thus it
may be easily assimilated by the plants.
 It must have essential elements in the form of a compound, which can be
easily assimilated by plants.
 It should not alter the acidity or alkalinity of soil.
 It should not be fairly stable i.e it not decompose rapidly in soil and lose
its essential element.
 It storage properties must be good with little or no tendency to setting
or deliquescence.
3.List out the uses of fertilizer.
Ans-The uses of fertilizer are –











They boost crop yields.
Increases the protein content of the plants.
Imparts dark green colour to the leaves.
Improves overall quality of the plants.
Help in blooming and seed formation.
Increases vigour, resistance to frost and insects, pests and diseases.
Helps in the development of healthy root system.
Makes the stalks stronger.
Increases vigour and diseases resistance in the plants.
Enhances the synthesis of carbohydrates.
Help the ripening of cereals and fruits.
4.How is superphosphate manufactured?
Ans-A well powdered phosphate rock or bone ash mixed known quantity of
concentrate sulphuric acid is introduced into a cast iron chamber provided
with mechanical stirrer and two valves at bottom. Each valve opens in a big
chamber called den. The mixture is stirred for 2 to 5 minutes and then
dumped mechanically into one of the dens through the valve. The mass is
kept in the den for about 24 hours.
Ca3(PO4)2+2H2SO4+4H2O------>Ca(H2PO4)2+2CaSO4 .2H2O+heat
A mixture of calcium sulphate and calcium dihydrogen phosphate is
obtained .This mixture is called superphosphate.
5. Explain the Haber’s process of manufacturing Ammonia with a neat
diagram.
Ans-Nitrogen hydrogen are mixed in ratio of 1:3.Mixture is heated to 450-5500c,
compressed to high pressure such as 150-200 atmospheric pressure and passed
over hot Fe203,Al2o3mixture act as catalyst which results in ammonia is formed.
N2+3H----------------->2NH3
For diagram refer page no-171 Fig-13.3.
6. What are the disadvantages of artificial fertilizers?
Ans- Disadvantages of artificial fertilizers are



Constant application is needed.
Causes soil pollution, water pollution.
Causes plant toxicity
Leads to biomagnifications.
7. How is Urea manufactured?
Ans-Urea is manufactured from ammonia.
Ammonia +Carbon dioxide =======>Ammonium Carbonate +Urea + water
2NH3+CO2------------>NH2COONH2+ NH2.CO.NH2+ H2O.
8. “ We Have to use fertilizers judiciously .” Discuss the validity of this statement.
Ans- I) The amount of fertilizer added to the soil varies from crop to crop. They
should only be used when necessary. Excessive use of fertilizers degrades
the quality of soil in the long run. For example, excessive use of nitrogenous
fertilizers makes the soil and water rich in nitrates. Nitrogen rich water is
not good for drinking. It flows into lakes and rivers with rain water which
enhance the growth of weeds and algae, decreasing the oxygen content of
water leading to death of aquatic life.
II) Excessive use of fertilizers can change the nature of the soil making it either
too acidic or too alkaline .Hence fertilizers Should be used judiciously.
9. Name the most important elements required for a plant growth.
Ans-The element required for plant growth are nitrogen phosphorous and
potassium .
10. What is the importance of soil testing for a former?
Ans-Soil testing is very important for a former because he must know the
deficiency of the important elements such as nitrogen , phosphorus and
potassium. Also he must know the acidic nature or alkaline nature of the soil.
11. Give example for NPK fertilizers.
Ans- *Nitrogenus- Urea . *Phosphatic- Super phosphate .
* Potassium- Potassium nitrate.
12. What are the special properties of manures over artificial fertilizers.
Ans- Manures are organic matter called humus. When they are added to the soil
not only they give proper nutrients to the plants ,but also restores the soil texture
for better retention of water and for aeration of soil .E .g: Organic matter present
in the manures increases the water holding capacity in sandy soils and drainage
in clayey soil. The organic matter of manures provides food for the soil organisms
such as earth worm bacteria, fungi etc. which provide nutrients to plants .But
artificial fertilizer don’t do the above except supply of nutrients.
ELECTRONIC CONFIGURATION
I.
Four alternatives are giving to each of the following incomplete
statements/questions. Choose the right answer.
1. Which of the following shell has the highest energy?
(a)L
(b) M
(c)K
(d) N
2. The sub shell present in L-shell are______________
(a)s and d (b)s and p
(c)s,p and d (d)s, p d and f
3. Among 4s, 3d, 4d and 4p the orbital having least energy is
_______________
(a) 4s
(b) 4d
(C) 3d
(d) 4p
4. The maximum number of election in M-shell is_______________
(A) 2
(b) 32
(c) 18
(d) 8
5. The number of valence electrons of 13Al27is____________
(a) 13
(b) 3
(c) 27
(d) 8
6. Identify the element which has completed the octet structure___
(a)K19
(b) Ca20
(c)Na11
(d) Ar18
II.Fill in the blank.
1.The shape of the p-orbital is dumbell shape.
2.The number of electrons present in an atom of atomic number 17 is 17
2 2 3
3.The electronic configuration of nitrogen is 1s ,2s 2p
4.The electronic configuration of the noble gas nearest to the element
1 2
scandium (21)is,[Ar]3d ,4s
2 2 6 2
5.The complete electronic configuration of Iron [Fe] is 1s ,2s 2p ,3s
6 2 6
3p ,4s 3d
6.The direction of spin of two electrons present in a single orbital are
opposite.
III.Answer the following
1. Explain atomic orbital with the necessary diagram.
Ans- The three dimensional region in space around the nucleus where there
is a maximum probability of the existence of an electron is called the atomic
orbital.The atomic orbitals are mainly of four types. They are s-orbital ,porbital,d-orbital and f-orbital.s-orbital is spherical in shape ,p-orbital is dumb
bell shape and d-orbital is double dumb bell shape.
For diagram refer page no-234.
2. State pauli’s exclusion principle.
Ans-Paulis exclusion principle is state that “no two electrons in the same
atom will have the four quantum number identical”.
3.State Aufbau principal.
Ans- Aufbau principal state that “In the ground state of the atoms the
orbitals are filled in order of their increasing energies"
4.What is meant by electronic configuration? Explain with an example.
Ans:-The distribution of electrons in different orbitals is known as electronic
configuration. The distribution of electrons into the orbitals of an atom takes
place according to the Afbau principle which is based on Pauli’s exclusive
principle and the Hund’s rule of maximum multiplicity. eg-magnesium atomic
no-12 then electronic configuration of oxygen is 1s2 2s2 2p63s2.In this orbital
contains only 2 electrons this is the lowest energy level next sub shell is 2s
which contains 2 electrons and 2p contains 6 electrons. The third sub shell 3s
contains 2 electrons.
5.Draw the shapes of s,p and d orbitals.
Ans-For diagram refer page no 234.
6.Write the electronic configuration of the following atoms.
Ans-a)Oxygen(Z=8)-1s2,2s22p4
b)chlorine(Z=17)-1s2,2s22p6,3s23p5.
c)calcium(Z=20)-1s2,2s22p6,3s23p6,4s2
d)Iron(Z=26)-1s2, 2s2 2p6 ,3s2 3p6 ,4s2 3d6.
7.State Hund’s rule.
Ans-Hund’s rule state that “among the orbitals of same energy electron do
not start pairing until all these orbitals are singly occupied’’.
8.Name the subshells of an atom which is being influenced by magnetic field.
Ans – In L,M and N shells the sub shell. Which are influenced by magnetic
field are s, p,d and f .
9.Write the differences between orbits and orbitals.
Ans- orbit
 It is a definite circular path in which the electron revolves round the
nucleus.
 It is circular in shape.
 It can accommodate a maximum of 2n2 electrons, where n is the shell
number
 It refers to a shell.
Orbitals
 It is the three dimensional region around the nucleus, in which there is a
maximum probability of finding the electron.
 It has different three dimensional shapes
 It can accommodate a maximum of two electrons
 It refers to a sub shell.
10. Which quantum number help us to calculate the maximum number of
electron population in Bohr’s energy levels K,L,M,N .Write the formula used
with example.
Ans-Principal quantum number n help us to calculate the
Maximum number of electron population .The maximum number of
electrons= 2n2.
K shell contains 2x12=2 electrons.
L shell contains 2x22=8 electrons.
M shell contains 2x32=18 electrons.
N shell contains 2x4232 electrons.
UNIT -5
CHEMICAL BOND
I.Choose the correct answer.
1.covalent bond is formed when sharing of electrons take place.
2.Which of the following compounds does not contain covalent bond-MgCl2
3.In double covalent bond there is sharing of 2 pair of electrons.
4.In case of sodium chloride the chemical bond by the transfer of valence
electrons.
II.Match the following.
1.Ionic bond= transfer of electrons.
2.Covalent bond=sharing of electrons.
3.Metallic bond=delocalized electrons.
4.Hydrogen bond=hydrogen positive and electro negative element.
III.Anwer the following.
1. What is the chemical bond?
Ans:The linkage that bind atoms to form molecules is known as chemical bond.
2.What is octa configuration?
Ans:The electronic configuration of an atom ends with ns2np6i.e outer most shell
has 8 electrons is called octet configuration.
3.Write the difference between ionic and covalent compounds?
Ans:IONIC COMPOUND:
*They are formed by the complete transfer of one or more electrons from the
outer most energy shell of one atom to outermost energy shell of another atom.
COVALENT COMPOUND:
*They are formed by sharing of pair of electrons to form covalent formation
.Hence valence electrons are shared.
4. Write Lewi ‘s electron dot formula of water.
Ans: Refer page no-254 Fig-19.9.
5.(a) Explain bond formation in sodium chloride.
Ans:Sodium has only one electron in the outer most energy level.The atomic
number of sodium is 11.Its electronic configuration is 2,8,1.The atomic number of
chlorine is 17 and its electronic configuration is 2,8,7.The sodium loses one
valence electron from its outer most energy level and attains the stable electronic
configuration of nearest inert element neon 2,8.
The chlorine atom gains one electron in its outer most energy level to attain the
stable electronic configuration of nearest Argon 2,8,8.
Ne-e+-------------Na+(2,8)
Cl+e+---------------Cl-(2.8,8)
Na++Cl----------------NaCl.
(b)Explain how Zn+2AgNO3-------------2Ag+Zn(NO3)2is a redox reaction.
Ans:The reactants are Zn+2AgNO3
The product are 2Ag+Zn(NO3)2
AgNO3and Zn(NO3)2are ionic compounds. Chemical equation can be represented
as
Zn+Ag+No-3---------------------Zn2+(NO3)2-+2Ag
Zinc has become zinc ion by losing 2 electron silver ion has become silver by
gaining electrons.Zinc is oxidized to zinc ions and silver ion is reduced to silver
which means in this chemical reaction there is both loss electrons and gain of
electrons.Since both reduction and oxidation has happened in this reaction .the
reaction is redox reaction.
6 .What is hydrogen bond?
Ans; The attractive force that bind hydrogen atom of one molecule with
electronegative atom of the other molecule of the same or different molecule is
known as hydrogen bond.
7.What is electron sea model?
Ans: We can imagine that a lattice of positive ions of the metal as submerged in
the electron flow such a model is called electron sea model. Such a model is
called electron sea model.
8. What is difference between the cation and anion? give an example.
Ans:* Cation :-An atom which loses a negatively, charged particle and becomes
positively charged ion or cation.eg-Na+
*Anion: An atom which gains a negatively charged particle and becomes
negatively Charged ion or anion eg-Cl-.
9. Describe hydrogen bonding in water.
Ans:In the case of water molecule, the oxygen end is more electronegative the
hydrogen end .So the shared electron pair remains closer to oxygen atom.This
results in the separation of positive and negatively charged oxygen atom exerts an
attraction on the positively charged hydrogen atom of another molecule resulting
in a hydrogen bond.
10.Explain the term metallic bonding .
Ans:Metallic ions are Arranged in crystalline forms. In metals electron of same
energy level form number of arrays. These arrays of electron occupy the entire
metals.
The positive ion of a metals gets submerged in the delocalized electrons These
delocalized electrons without belonging to a particular atom occupy the entire
metal. The positive ions of the metal are held in position by these means of light
electrons hence metallic bonds are formed.There is no directionality in metallic
bonds as in ionic bonds.
III)
Give scientific reasons:1) Metals conduct electrons.
Ans:-Due to presence of delocalized electrons in the metal are the
main reasons for conductivity of electricity.
2)The sigma bond is stronger than pi- bond.
Ans:-Sigma bond is formed by axial overlap where as pi bond is
formed by side way overlap of electron. Since the axial overlap is
stronger than the side way overlap, Hence sigma is stronger than
the pi bond.
3)The ionic compounds have high melting point and boiling point.
Ans: Ionic compound are mostly crystalline solid having high
strength of bond. That’s why ionic compounds possess high
melting point and boiling point.
4) Water exists in liquid state over a wide range of temperature Oo C to
1000C.
Ans:-This is due to hydrogen bonding which causes association of
molecules. Energy is required break the associated molecules
.Therefore water exists in liquid form over a wide range of
temperature.
5)Anti oxidants are added to foods containing fats and oils.
Ans:-When food containing fats and oil is kept for a long time , it
becomes rancid and taste change due to oxidants are added.
6)Covalent compounds dissolve in organic solvents.
Ans: Organic solvents are mostly covalent compounds dissolve in
organic solvents.
UNIT -6
BASIC OF COMPUTER
I. Choose the right answer.
1. Which operation is not performed by computer understanding.
2. Central processing unit is combination of arithmetic logic and
control unit.
3. The language that is directly understood by the computer without
translation program is machine language.
II. Answer the following.
1.What are the functions of computer ?
Ans: Functions of a computer are ;
*Input *Process*Output*Storage.
2.Differetiate between RAM and ROM.
RAM:
*This is called Random access memory. In this information stored can
be changed, erased or rewritten .In this memory as soon as the
computer is switched off the contents of the primary memory is lost
.It is called temporary memory.
ROM:
*This is called read only memory. The information is programmed
during the manufacturing of the computer.
*Content of these memory cannot be altered , but only be read.
*This memory is not lost even when the computer is switched off.
*This is called permanent memory.
3.Draw the block diagram of computer.
Ans: Refer page no-276 Fig-21.1.
4.Differentiate between optical mark reader and magnetic card
reader.
Ans: Optical mark reader:-This reads pen/pencil mark on the
documents Check and give results which are saved to a file in a
computer.
Magnetic cards reader:- There is a device that reads the data from a
magnetic strip in card on which the data can be recorded. This data
can be stored in the computer.
5.Classify the following into input and output devices and explain
how they are used to perform input and output function –mouse,
printer, track ball, OMR, speaker, projector ,light pen joy stick.
Ans: INPUT DEVICE:
*Mouse, track ball, optical mark reader, light pen, joy stick.
OUTPUT DEVICE:
Printer ,speaker, projector.
*Mouse-it is a small hand held device used to select menu ,files, start
programs etc .using a pointer. It inputs the data by selecting, opening
and dragging icons or options.
*Track ball-It is a computer cursor or pointer control device. The
user rolls the ball to directed at the desired place on the screen to
select desktop objects or position the cursor for text entry.
*Optical mark reader-It is used to read pen/pencil mark on the
documents marked answer in OMR sheets and give results which are
saved to a file in a computer .
*Light pen- Light pen is also a device .Which is used to operate
computer. It functions like a mouse. A pen shaped device used to
select objectives directly on a display screen. Mostly used in mobile
phones.
*Joy stick-While playing video games we use this to control games.
OUTPUT DEVICES;
*printer- If we want to printouts of the work done in computer. we
use a printer .Therefore printer is used to produce paper out of the
information processed in a computer.
*Speaker-If we want to listen to music stored in computer, we need
speakers. Therefore the computers can give the audio out put
through the speaker.
*Projectors-If we want to show the work done in a computer to
many people at a time , we use projectors which project pictures and
text information on a screen which are generated through a
computer.
6. List out the primary and secondary storage devices.
Ans; Primary storage device
*Random access memory(RAM)
*Read only memory (ROM)
Secondary storage memory devices are CD-ROM and pendrive.
7.What is the different between hardware and software of a computer
Ans: HARDWARE
*The computer part that you can physically see, touch and feel are
called hardware.
*It includes input devices, output devices ,processor and storage
devices.
SOFTWARE
*The instructions given to the computer in the form of a program is
called software.
8.How are computers useful in the field of medicine?
Ans: In the field of medicine
*Diseases are diagnosed using computers through magnetic
resonance imaging.(MRI)
*Scanning to examine the internal organs of the human body.
*Computer are used while performing surgery to assist the surgeon.
9.Why software is essential to run the computer discuss.
Ans; A software is very essential for a computer to work. Because
computer itself is a device meant for software. There is a system
software which helps the computer to understand its parts and to
recognize the input and output devices. There is an application
software helping the programmer, who feeds the written program to
the computer. These show that software is essential to run the
computer.
A computer executes these instructios are called programs.
10.We find applications of computer in almost every sphere of life
discuss.
Ans: There are hundreds of applications of computer in our life. It is
very difficult to make a list of them. Day by day new applications are
arising. Following are some of the applications of computer which we
can list and discuss.
*Financial transactions in the bank.
*In telecommunications.
*Use of computers in defence.
*Online examinations through computers and get instant results.
*In the working of ATMs.
*Controlling of Robots by computer.
*Use of computer in aircrafts and satellites.
*Use of super computers in weather forecasting.
*In (CCTV) closed circuit T.V. computers are used.